Over the years, it’s been possible for Salesforcce Developers to avoid needing to learn JavaScript because things could usually be done through a combination of apex and visualforce. If you don’t know JavaScript and you are a Salesforce Developer, you need to really consider finishing this post and learning JavaScript. …
JavaScript uses functions as the primary way to define scope any variable defined inside of a function is in the local scope. A variable defined outside of a function is in the global scope.
Environment variables, also known as env, allow us to have applications we build behave differently based on the environment that they are running in. Well designed applications use environment variables and allow us to rapidly deploy to new environments.
There’s a lot of reasons why you may want to sort an array, often it is done to make things easier for the user of the application to understand the data. Arrays are normally sorted to be in ascending order (or alphabetical).
PHP’s time() function returns the current unix timestamp. JavaScript doesn’t exactly have the same functionality, but it’s pretty close. Put a different and more understandable way, it returns the current time measured in seconds since the Unix Epoch (00:00:00 UTC on 1 January 1970).
JavaScript has a similar way of getting the time but it’s in milliseconds since the Unix Epoch.
In the past, there’s been so many times I needed to tell if an object was numeric. With the below function, it’s very easy to tell if an item is numeric. If your project is already using jQuery, you could always use jQuery.IsNumeric()
Dates and DateTimes are difficult to deal with in most languages. The Date object is a datatype that’s built in the JavaScript language. In JavaScript, the biggest problem is that the browsers aren’t overly consistent in the way they have implemented the Date object and its APIs. …
It’s no secret that many of us that use javascript regularly love jQuery because it handles a lot of the cross browser issues and makes our lives so much easier. The .ajax function makes use of caching by default, but we can override this by creating a function called .ajaxSetup and adding cache: false in…
Magento is an insanely flexible system that has a lot of potential, but of course with this flexibility comes a lot of learning.
Adding a JavaScript file and a CSS file to a specific CMS page isn’t very difficult. We should always consider adding the JavaScript file or CSS file to the theme if we’re going to use it on more than one specific page.…
jQuery Mobile is an absolutely amazing javascript framework that can easily assist developing mobile friendly websites. jQuery Mobile is easily summarized by its authors to: “Delivering top-of-the-line JavaScript in a unified User Interface that works across the most-used smartphone web browsers and tablet form factors.” After adding jQuery Mobile to my first application, I discovered…
Error: uncaught exception: [Exception… “Component returned failure code: 0x805e000a [nsIXMLHttpRequest.open]” nsresult: “0x805e000a ()” AdBlock interferes with the XmlHTTPRequest object and is known to sometimes break the way jQuery functions especially if the url triggers some sort of url filter. You have a few options to resolve the solution: suggest that users turn off AdBlock if…
jQuery in Action, First Edition is written by Bear Bibeault and Yehuda Katz and is probably the simplest and easiest to understand programming book available. Target reader is somebody that already is using javascript in projects and is looking to push the limits of their web applications by using jQuery and many of it’s great…
jQuery is very well suited for cross browser JavaScript development, but I bet you didn’t know jQuery is also fairly well suited to parsing XML. I often use jQuery to send XMLHttpRequests and then parse the XML returned by a PHP script on the server and then manipulate the return in some way. I won’t…
jQuery is so powerful and very flexible and usually makes so many complex takes so simple. Anything with a scrollbar and can be selected can be programatically scrolled to to the top. $(div).scrollTop(); Scrolling to top of browser window is as simple as: $(window).scrollTop(0);
jQuery is a really popular JavaScript library that helps really simplify manipulating HTML with JavaScript whether it be CSS, animations or even doing Ajax. I’ve been using jQuery since at least mid 2008 and have to say that I just love how much easier things are and not having to generally deal with the cross-browser…
Setting focus to the 1st field in jQuery is actually really simple: there are some plugins that also can do it automatically on each reload of a form. I usually just use the following code on any pages where there is a form. <script type=”text/javascript”> $(document).ready(function() { $(“input:text:visible:first”).focus(); }); </script> Hope this helps.
David Tang has written a simple and elegant plugin for jQuery that allows a div to be placed in the middle of a page.
Many more senior web developers can remember throwing tags all over the contents of websites and using tables for the presentation of content: these practices are said to be intrusive and a maintenance nightmare especially when the font colour should be pink instead of black on a header. Unobtrusive JavaScript is another best practice for…
JavaScript and the respective frameworks have really began to gain traction over the last couple of years. I would argue that most of the JavaScript frameworks are excellent, and truly are great for the user experience and for the programmer experience.
